(19)
(11) EP 0 481 810 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.09.1992 Bulletin 1992/36

(43) Date of publication A2:
22.04.1992 Bulletin 1992/17

(21) Application number: 91309637.6

(22) Date of filing: 18.10.1991
(51) International Patent Classification (IPC)5: C08L 21/00, C08K 3/04
// (C08L21/00, 45:02, 93:04, 57:02)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 19.10.1990 JP 282418/90
21.02.1991 JP 27112/91

(71) Applicant: SUMITOMO RUBBER INDUSTRIES LIMITED
Kobe-shi Hyogo-ken (JP)

(72) Inventors:
  • Terakawa, Katsumi
    Hyogo-ken (JP)
  • Sekido, Fumio
    Akashi-shi, Hyogo-ken (JP)

(74) Representative: Allard, Susan Joyce et al
BOULT, WADE & TENNANT 27 Furnival Street
London EC4A 1PQ
London EC4A 1PQ (GB)


(56) References cited: : 
   
       


    (54) Rubber composition for laminated vibrationproofing structure


    (57) Disclosed is a rubber composition having high damping capacity as well an other excellent properties for example, dependence of elastic modulus on temperature, shear deformation, etc., which is suitable for laminated vibrationproofing structures. The rubber composition contains carbon black for use in a rubber having an iodine adsorption of 70 to 115 mg/g and DBP adsorption (method A) of 115 to 70 ml/g in an amount of 30 to 70 % by weight based on 100 parts by weight of a base rubber. The rubber composition is characterized by further containing:
       an aromatic petroleum resin having a softening point of 70 to 140°C and a bromine value of 0 to 0.2; and
       cumarone-indene resin and/or rosin in the ratio which satisfies the relation:

    wherein A is a total amount of cumarone-indene resin and rosin formulated, B is an amount of an aromatic petroleum resin formulated and B is not 0.





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